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The reason your friends chicks died was very, very likely just a coincidence. There are no studies I am aware of that show vaccinated chicks have a higher death rate than unvaccinated chicks.
Actually, last year McMurray had 2 hatches that received contaminated vaccines and hundreds upon hundreds of chicks died. Unfortunately, these chicks were shipped out to customers and people opened chick boxes to dead and/or dying chicks. It was horrible.
I had ordered chicks last year at the same time as this was happening, and the fact that I chose not to vaccinate actually saved my chicks. When I placed my order with McMurray this year I inquired as to what reasons were behind the chicks expiring and they told me it was a bad batch of vaccine that affected two hatches.
My reason for not vaccinating is because I want a flock as organic as possible, as nature intended.
I also do not allow people in my coops and I quarantine any newbies.